gecky
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Hi All,
i need to extract the g-values of a FET for mixer analysis. Basically, the transconductance is expanded as a power series with:
Ids-Ids0=g0*(Vgs-Vgs0)+g1*(Vgs-Vgs0)^2)+g2*(Vgs-Vgs0)^3)+g3*(Vgs-Vgs0)^3.......
Ids0=Ids at FET biasing point.
Vgs0=FET gate bias volt.
(assume common source FET mixer)
I managed to extract the Ids vs Vgs curve from ADS.
Question is how can I fit the polynomial to the I-V curve?? Eg, using MatLab....I tried the curvefit function in matlab but it doesn't work.
Thanks!
Added after 1 minutes:
Left this out:
I want to find g0,g1,g2....
i need to extract the g-values of a FET for mixer analysis. Basically, the transconductance is expanded as a power series with:
Ids-Ids0=g0*(Vgs-Vgs0)+g1*(Vgs-Vgs0)^2)+g2*(Vgs-Vgs0)^3)+g3*(Vgs-Vgs0)^3.......
Ids0=Ids at FET biasing point.
Vgs0=FET gate bias volt.
(assume common source FET mixer)
I managed to extract the Ids vs Vgs curve from ADS.
Question is how can I fit the polynomial to the I-V curve?? Eg, using MatLab....I tried the curvefit function in matlab but it doesn't work.
Thanks!
Added after 1 minutes:
Left this out:
I want to find g0,g1,g2....